Bronchus -

Lined with ciliated pseudostratified columnar epithelium and goblet cells that produce mucus to trap dust and pathogens. Physiological Functions

Moistens and warms air as it enters the body to prevent damage to delicate lung tissues. Common Clinical Conditions Bronchi: What Are They, Function, Anatomy & Conditions bronchus

The "mucociliary escalator" uses rhythmic ciliary motion to push mucus and trapped particles upward toward the pharynx for clearance. bronchus

Involuntarily controlled muscle that regulates airflow by contracting (bronchoconstriction) or relaxing (bronchodilation). bronchus